Sylvania



(No Model.) 7 2 Sheets-Sheet 1.

B. S. BROWN.

TRUCK FOR DENTAL CHAIRS.

No. 425,654. Patented Apr. 15, 1.890.

(No Model.)

2 Sheets-Sheet 2. B. s. BROWN.

TRUCK FOR DENTAL GHAIRS.

Patented Apr 15, 1890.

umusmnzns cc, mom-mum, wuumam, n. c.

UNITED STATES /PATENT Orrrcis.

BENONI S. BROWN, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE S. S.

WVHITE DENTAL MANUFACTURING COMPANY, OF PHILADELPHIA, PENN- SYLVANIA.

TRUCK FOR DENTAL CHAIRS.

SPECIFICATION forming part of Letters Patent No. 425,654, dated April 15, 1890. Application filed September 7,1889. Serial No. 823,285. (No model.)

To all whom it nury concern:

Be it known that I, BENONI S. BROWN, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Trucks for Dental Chairs; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanylng drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in trucks for dental chairs, the object being the construction of a truck particularly adapted to be attached to the legs of a dental chair, whereby said chair can be easily moved from place to place by the operator; and it consists 1n the construction and novel combination of parts, hereinafter described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended.

In the accompanying drawings, in which similar letters of reference designate corresponding parts in the different figures, Figure 1 is a side elevation of the truck, showing the chair in dotted lines resting on the floor. Fig. 2 is a side elevation showing the truck supporting the chair above the floor. Fig. 3 is a plan view. Fig. at is a section through Fig. 3 on the line w x.

The main frame of the apparatus consists of the front transversestandard A, firmly secured to one end of the longitudinal support 13, to the other end of which is pivoted the rear transverse standard'A', semicircular in form. This is accomplished by the screw is passing through the upper part of the standard into the end of the longitudinal support. From the ends of the standard A and the middle of the standard A project horizontally the parallel flanges cl, forming bearings for the swivels e of the casters E. From about midway of the swivels 6, between the flanges, a pin 6 projects to prevent the casters from dropping out if the apparatus should be raised from the floor. From the flanges d of the front standard A, and .from the ends of the rear standard A, project the vertical flanges a and the inclined horizontal flanges f. Upon the inclined flanges f the legs of the chair with which the apparatus is to be used is seated. The inclination of the inclined flanges f is the same as that of the legs of the chair, so as to fit without scratching the varnish with which they come in contact and to give a firm support. From the sides of the longitudinal support extend the projections I), having the lugs I) extending upward from them. On these lugs is pivoted the cam S. That part of the horizontal support above the projections 12 is cut away for the reception of the cam. This cut is made of such a depth as will bring the upper side of the cam flush with the top of the support when turned down. The length and thickness of the projections Z) compensate for the material cut away so as not to weaken the support.

A foot-lever L is made integral with the cam S and extends backward to such a position as to be readily operated by the person using the apparatus. Near the ends of the longitudinal support, about midway from the cam, are the lugs l, in which are pivoted the levers M and M. The inner ends of these levers rest upon the cam S. The outer end of the lever M is bifurcated. The outer ends of these levers rest on the tops of the swivels of the casters E. WVhile the chair is resting on its legs the tops of the swivels project a short distance, equal to the height it is necessary to raise the chair to give it a good clearance of the floor above the tops of their bearings. The object of this will be explained farther on.

To the rear standard A is pivoted the catch H by the screw h. The lower end of this catch is weighted at V. The upper end of the catch has an inclined surface If. This catch is to hold the lever L when depressed. The weighted end XV holds it in position for engagement with the lever L. A pin we conlines the movement of the catch to such an extent as is necessary for it to engage and disengage with the lever.

The truck would be generally used with the Morrison dental chair, as that is the one in common use at the present time. This chair has its front legs more nearly vertically inclined than the rear ones. Consequently the truck would when in position extend too far front. To overcome this difficulty, the front end of the longitudinal support is slightly curved upward, thus raising the front standard to such a height as will be found necessary to bring the trucksquarely under the front of the chair, as shown in Fig 1.

When it is desired to move the chair, the operator presses the lever L down with his foot until it engages with the catch B. This move ment of the lever partly revolves the cam S, which forces upward the inner ends of the levers M and M. The outer ends of these levers, which rest on the top of the swivels,

willcause the chair to be raised from the floor till the tops of the swivels are flush with place, as the entire weight is carried by the move evenly over the floor.

casters. hen it has reached the desired position, to lower it the operator presses the inclined surface 1- of the catch H, which proj ects over the lever L, releasing it. By keeping his foot on the lever and gradually reducing the pressure, he allows it to descend and rest upon its legs.

Three casters are used, so that they will The pivoting of the rear standard allows a slight movement of the chair to the right or left.

To keep the chair in place on the truck, the flanges a are provided with set-screws a, which can be forced against the legs of the chair in such a manner as to retain it upon the truck.

Having thus described my invention, I desire to secure by Letters Patent of the United States the following:

1. As an improvement in trucks for dental chairs, the frame consisting of the transverse standards A A and the longitudinal support B, connecting said standards, the casters carrying said frame, the cam pivoted on said frame, the lever L, operating and made integral with said cam, and the catch I-I, pivoted to the lower part of a leg of the rear standard for engaging with said lever when depressed, and the levers M M, pivoted near the ends of the longitudinal support, having their inner ends resting on said cam and their outer ends on the tops of the swivels of the casters, substantially as and for the purpose specified.

2. As an improvement in trucks for dental chairs, the frame consisting of the longitudinal support carried by the front standard A, rigidly secured to the front end, and the standard A, pivoted 011 the rear end, the integral cam and lever pivoted on said support, the levers M and M, pivoted near the front and rear ends of said support, having their inner ends resting on the cam. S and their outer ends on the tops of the swivels of the casters, and the casters journaled in suitable flanges extending from the legs of the standards, substantially as and for the purpose set forth.

3. The combination of the longitudinal support 13, carried by the transverse standards A A, attached to its ends, the lever E and cam S, made integral, pivoted midway on said support, which is cut away at that point for the reception of the cam, and made broader below the same, the catch I-I, pivoted to a leg of the rear standard to engage with the lever L when depressed, the levers M M, pivoted near the ends of the longitudinal support, having their inner ends resting on the cam and their outer ends on the swivels of the supporting-casters, and the casters journaled in flanges projecting horizontally from the legs of the transverse standards, and having the pins 6 projecting from each swivel between the fianges, substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

BENONI S. BROWN. \Vitnesses:

SIMEON SNOW, ADA K. YOUNG. 

